Pneumatic paintbrush



FRANK POLCHO, OF MELVIN, MICHIGAN.

PNEUMATIC PAINTBRUSH.

Specification of Letters Patent.

Patented Apr. 6, 1920.

Application filed February 21, 1917. Serial No. 150,096.

To all whom it may concern Be it known that I, FRANK PoLoHo, a citizenof the United States, residing at Melvin, in the county of Sanilac andState of Michigan, have invented new and useful Improvements inPneumatic Paintbrushes, of which the following is a specification.

This invention relates to pneumatic paint brushes, and the object is toprovide certain efficient and novel means for controlling the passage ofpaint through the handle and through the shank portion of the brush, tothe bristles thereof.

A further object is to provide means for definitely and exactlycontrolling-the movement of the valve, and a still further obj eot is toprovide adjustable resilient means for effecting the closing movement ofthe valve regardless of the consistency of the paint being used.

In the drawings, Figure 1 is a view of the brush partly in longitudinalsection, showing the valve controlling means. Fig. 2 is a longitudinalsection on another plane.

The brush as a whole is designated 25, and the handle thereof isprovided with a longitudinally extending tube 26 for conducting thepaint under pressure. The bristles are secured within socket member 28,and the paint flows to said socket member and thence to the bristlesthrough a connection 29 carried by member 28 and fitting within the end30 of the tube 26. The tube last mentioned is provided with a rotarycut-ofl" member 31 extending transversely of the tube, and carrying atthe outer end a disk 32 provided with teeth 33 extending partiallyaround the circumference of the disk. These teeth are engaged by teeth 3L on slide 35, the latter having a thumb member 36 to permit of itsoperation for controlling the supply of paint. Slide 35 is provided witha longitudinal slot 86 for receiving guide pins 37 secured to the shankmember of the brush, this shank being provided with a transverse slot 38carryin the slide. The end of slide 35 is provided with an offset 43engaged by a coiled spring 44 for the purpose of retaining the slide inposition to hold the cut-01f device 32 closed. This device will beopened during operation and held in that position by the pressure of thethumb or one of the fingers. It will be understood that the members 28and 40 of the brush are secured by suitablefastening devices indicatedat 45.

In Fig. 2 connection 29 enters an apertured discharge head 29 and asimilar connection is shown at 62 in Fig. 2. Tube 15' connects the airpump with the tank 10.

What is claimed is A controlling device for a pneumatic paint brush,comprising a tubular casing, a slotted rotatable member operatingtherein, an element having a segmental toothed portion carried by therotatable member, a slidable device provided with a rack engaging thetoothed element, the slidable device having a guiding slot therein,means engaging the slot last named, an offset device on one end of theslidable device, and an adjustably mounted spring engaging the offsetdevice.

In testimony whereof I afl'ix my signature.

FRANK POLCHO.

